With over 50 years of experience in the design, evaluation and retrofit of structures, SDL has an extensive portfolio including mixed-use, corporate, commercial, retail, parking, hospitality, education, residential, aviation, healthcare, government, sports and recreation, religious, cultural, historic renovation, industrial, and specialty structures. Our engineers are registered in 46 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands and consult with clients throughout the United States and abroad.